Revert "Remove an unused plugin"

This reverts commit 9c46f70.

Author: moznion

project/plugins.sbt

@@ -1,5 +1,6 @@
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.3.4")
 addSbtPlugin("de.heikoseeberger" % "sbt-header" % "5.4.0")
+addSbtPlugin("com.typesafe.sbt" % "sbt-git" % "1.0.0")
 addSbtPlugin("com.github.gseitz" % "sbt-release"  % "1.0.13")
 addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.9.2")
 addSbtPlugin("com.jsuereth" % "sbt-pgp" % "2.0.1")